/cgl/ - Cosplay & EGL

>friend B wants to be part of friend A and I's group cosplay
>really don't want friend B to be part of our group
>but friend A heavily believes in "the more the merrier"
>friend B doesn't even like the anime series
>she never puts effort into her cosplays
>brags about how she can make cosplays without a sewing machine
>previous cosplay was a disgusting mess of superglue and fraying fabric
>she doesn't even bother to wear any makeup
>character she's choosing to cosplay has dark blue hair
>says she can go without a wig since her black hair is close enough

I really want to cosplay from this series but I don't know how to tell friend B to fuck off or put in more effort, especially since friend A and her are pretty close.